.bgbubbles {
  position: absolute;
  // 使气泡背景充满整个屏幕；
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  // 如果元素内容超出给定的宽度和高度，overflow 属性可以确定是否显示滚动条等行为；
  overflow: hidden;

  li {
    position: absolute;
    // bottom 的设置是为了营造出气泡从页面底部冒出的效果；
    bottom: -160px;
    // 默认的气泡大小；
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.15);
    list-style: none;
    // 使用自定义动画使气泡渐现、上升和翻滚；
    animation: square 15s infinite;
    transition-timing-function: linear;
    background: rgba(236, 74, 207, 0.7);
    box-shadow: 0 0.3px 0.7px rgba(0, 0, 0, 0.126),
      0 0.9px 1.7px rgba(0, 0, 0, 0.179),
      0 1.8px 3.5px rgba(0, 0, 0, 0.224),
      0 3.7px 7.3px rgba(0, 0, 0, 0.277),
      0 10px 20px rgba(0, 0, 0, 0.4);

    // 分别设置每个气泡不同的位置、大小、透明度和速度，以显得有层次感；
    &:nth-child(1) {
      left: 10%;
    }

    &:nth-child(2) {
      left: 20%;
      width: 90px;
      height: 90px;
      animation-delay: 2s;
      animation-duration: 7s;
      background-color: rgba(0, 255, 51, 0.3);

    }

    &:nth-child(3) {
      left: 25%;
      animation-delay: 4s;
    }

    &:nth-child(4) {
      left: 40%;
      width: 60px;
      height: 60px;
      animation-duration: 8s;
      background-color: rgba(5, 38, 255, 0.8);
    }

    &:nth-child(5) {
      left: 70%;
    }

    &:nth-child(6) {
      left: 80%;
      width: 120px;
      height: 120px;
      animation-delay: 3s;
      background-color: rgba(255, 255, 255, 0.6);
    }

    &:nth-child(7) {
      left: 32%;
      width: 160px;
      height: 160px;
      animation-delay: 2s;
    }

    &:nth-child(8) {
      left: 55%;
      width: 20px;
      height: 20px;
      animation-delay: 4s;
      animation-duration: 15s;
    }

    &:nth-child(9) {
      left: 25%;
      width: 10px;
      height: 10px;
      animation-delay: 2s;
      animation-duration: 12s;
      background-color: rgba(255, 255, 255, 0.3);
    }

    &:nth-child(10) {
      left: 85%;
      width: 160px;
      height: 160px;
      animation-delay: 5s;
    }
  }

  // 自定义 square 动画；
  @keyframes square {
    0% {
      opacity: 0.5;
      transform: translateY(0px) rotate(45deg);
    }

    25% {
      opacity: 0.75;
      transform: translateY(-400px) rotate(90deg)
    }

    50% {
      opacity: 1;
      transform: translateY(-600px) rotate(135deg);
    }

    100% {
      opacity: 0;
      transform: translateY(-1000px) rotate(180deg);
    }
  }
}

.login {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;

}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background: url(https://i.loli.net/2019/11/17/GAYyzeKsiWjP5qO.jpg);
  background-size: cover;
  background-position: center;
}

.frostedglass {
  display: flex;
  justify-content: space-around;
  width: 72vw;
  height: 65vh;
  box-shadow: 0 0.3px 0.7px rgba(0, 0, 0, 0.126),
    0 0.9px 1.7px rgba(0, 0, 0, 0.179), 0 1.8px 3.5px rgba(0, 0, 0, 0.224),
    0 3.7px 7.3px rgba(0, 0, 0, 0.277), 0 10px 20px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(20px);
  transition: 0.5s ease;

  &:hover {
    box-shadow: 0 0.7px 1px rgba(0, 0, 0, 0.157),
      0 1.7px 2.6px rgba(0, 0, 0, 0.224), 0 3.5px 5.3px rgba(0, 0, 0, 0.28),
      0 7.3px 11px rgba(0, 0, 0, 0.346), 0 20px 30px rgba(0, 0, 0, 0.5);
  }

  .title {

    @media (max-width: 640px) {
      font-size: 2em;
    }
  }
}

.path {
  width: 40%;
  height: 100%;
  display: inline-block;
  //   margin-top: 18%;

  &>svg {
    width: 100%;
    height: 100%;

  }
}

.title {
  width: 40%;
  display: inline-block;
  height: 30%;
  margin-top: 10%;

}
